How severe is CVE-2026-33195?

CVE-2026-33195 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-33195 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-33195?

CVE-2026-33195 affects Rubyonrails Rails. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-33195?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-33195 have an EU (EUVD) identifier?

Yes. CVE-2026-33195 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14632.

When was CVE-2026-33195 published?

CVE-2026-33195 was published on 2026-03-24 and last updated on 2026-06-30.

CVE-2026-33195

CVE-2026-33195 is a critical-severity vulnerability in Rubyonrails Rails with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 8.0
EPSS exploit prediction: 1% (43rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-14632
Weakness: CWE-22
Affected product: Rubyonrails Rails
Published: 2026-03-24
Last modified: 2026-06-30

Description

Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Storage's `DiskService#path_for` does not validate that the resolved filesystem path remains within the storage root directory. If a blob key containing path traversal sequences (e.g. `../`) is used, it could allow reading, writing, or deleting arbitrary files on the server. Blob keys are expected to be trusted strings, but some applications could be passing user input as keys and would be affected. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.

Frequently asked questions

What is CVE-2026-33195?: Active Storage allows users to attach cloud and local files in Rails applications. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, Active Storage's `DiskService#path_for` does not validate that the resolved filesystem path remains within the storage root directory. If a blob key containing path traversal sequences (e.g. `../`) is used, it could allow reading, writing, or deleting arbitrary files on the server. Blob keys are expected to be trusted strings, but some applications could be passing user input as keys and would be affected. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.
How severe is CVE-2026-33195?: CVE-2026-33195 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-33195 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (43rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-33195?: CVE-2026-33195 affects Rubyonrails Rails. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-33195?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-33195 have an EU (EUVD) identifier?: Yes. CVE-2026-33195 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-14632.
When was CVE-2026-33195 published?: CVE-2026-33195 was published on 2026-03-24 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:rubyonrails:rails:*:*:*:*:*:*:*:*

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